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  the result is also \code{NA}.  In either case, the expression
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  the result is also \code{NA}.  In either case, the expression
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  \code{if(x == y)....} won't work as expected.
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  \code{if(x == y)....} won't work as expected.
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  The function \code{all.equal} is also sometimes used to test equality
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  The function \code{all.equal} is also sometimes used to test equality
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  this way, but it was intended for something different.  First, it
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  this way, but it was intended for something different.  First, it
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  tries to allow for ``reasonable'' differences in numeric results.
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  tries to allow for \dQuote{reasonable} differences in numeric results.
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  Second, it returns a descriptive character vector instead of
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  Second, it returns a descriptive character vector instead of
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  \code{FALSE} when the objects do not match.  Therefore, it is not the
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  \code{FALSE} when the objects do not match.  Therefore, it is not the
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  right function to use for reliable testing either.  (If you \emph{do} want
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  right function to use for reliable testing either.  (If you \emph{do} want
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  to allow for numeric fuzziness in comparing objects, you can combine
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  to allow for numeric fuzziness in comparing objects, you can combine
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  \code{all.equal} and \code{identical}, as shown in the examples
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  \code{all.equal} and \code{identical}, as shown in the examples